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574fb258 JC |
1 | /* |
2 | * sca3000_core.c -- support VTI sca3000 series accelerometers via SPI | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License version 2 as published by | |
6 | * the Free Software Foundation. | |
7 | * | |
0f8c9620 | 8 | * Copyright (c) 2009 Jonathan Cameron <jic23@kernel.org> |
574fb258 JC |
9 | * |
10 | * See industrialio/accels/sca3000.h for comments. | |
11 | */ | |
12 | ||
13 | #include <linux/interrupt.h> | |
574fb258 JC |
14 | #include <linux/fs.h> |
15 | #include <linux/device.h> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
574fb258 JC |
17 | #include <linux/kernel.h> |
18 | #include <linux/spi/spi.h> | |
19 | #include <linux/sysfs.h> | |
99c97852 | 20 | #include <linux/module.h> |
06458e27 JC |
21 | #include <linux/iio/iio.h> |
22 | #include <linux/iio/sysfs.h> | |
23 | #include <linux/iio/events.h> | |
24 | #include <linux/iio/buffer.h> | |
574fb258 | 25 | |
574fb258 JC |
26 | #include "sca3000.h" |
27 | ||
28 | enum sca3000_variant { | |
29 | d01, | |
574fb258 JC |
30 | e02, |
31 | e04, | |
32 | e05, | |
574fb258 JC |
33 | }; |
34 | ||
35 | /* Note where option modes are not defined, the chip simply does not | |
36 | * support any. | |
37 | * Other chips in the sca3000 series use i2c and are not included here. | |
38 | * | |
39 | * Some of these devices are only listed in the family data sheet and | |
40 | * do not actually appear to be available. | |
41 | */ | |
42 | static const struct sca3000_chip_info sca3000_spi_chip_info_tbl[] = { | |
845bd12a | 43 | [d01] = { |
25888dc5 | 44 | .scale = 7357, |
574fb258 JC |
45 | .temp_output = true, |
46 | .measurement_mode_freq = 250, | |
47 | .option_mode_1 = SCA3000_OP_MODE_BYPASS, | |
48 | .option_mode_1_freq = 250, | |
25888dc5 JC |
49 | .mot_det_mult_xz = {50, 100, 200, 350, 650, 1300}, |
50 | .mot_det_mult_y = {50, 100, 150, 250, 450, 850, 1750}, | |
845bd12a JC |
51 | }, |
52 | [e02] = { | |
25888dc5 | 53 | .scale = 9810, |
574fb258 JC |
54 | .measurement_mode_freq = 125, |
55 | .option_mode_1 = SCA3000_OP_MODE_NARROW, | |
56 | .option_mode_1_freq = 63, | |
25888dc5 JC |
57 | .mot_det_mult_xz = {100, 150, 300, 550, 1050, 2050}, |
58 | .mot_det_mult_y = {50, 100, 200, 350, 700, 1350, 2700}, | |
845bd12a JC |
59 | }, |
60 | [e04] = { | |
25888dc5 | 61 | .scale = 19620, |
574fb258 JC |
62 | .measurement_mode_freq = 100, |
63 | .option_mode_1 = SCA3000_OP_MODE_NARROW, | |
64 | .option_mode_1_freq = 50, | |
65 | .option_mode_2 = SCA3000_OP_MODE_WIDE, | |
66 | .option_mode_2_freq = 400, | |
25888dc5 JC |
67 | .mot_det_mult_xz = {200, 300, 600, 1100, 2100, 4100}, |
68 | .mot_det_mult_y = {100, 200, 400, 7000, 1400, 2700, 54000}, | |
845bd12a JC |
69 | }, |
70 | [e05] = { | |
25888dc5 | 71 | .scale = 61313, |
574fb258 JC |
72 | .measurement_mode_freq = 200, |
73 | .option_mode_1 = SCA3000_OP_MODE_NARROW, | |
74 | .option_mode_1_freq = 50, | |
75 | .option_mode_2 = SCA3000_OP_MODE_WIDE, | |
76 | .option_mode_2_freq = 400, | |
25888dc5 JC |
77 | .mot_det_mult_xz = {600, 900, 1700, 3200, 6100, 11900}, |
78 | .mot_det_mult_y = {300, 600, 1200, 2000, 4100, 7800, 15600}, | |
574fb258 JC |
79 | }, |
80 | }; | |
81 | ||
574fb258 JC |
82 | int sca3000_write_reg(struct sca3000_state *st, u8 address, u8 val) |
83 | { | |
574fb258 JC |
84 | st->tx[0] = SCA3000_WRITE_REG(address); |
85 | st->tx[1] = val; | |
25888dc5 | 86 | return spi_write(st->us, st->tx, 2); |
574fb258 JC |
87 | } |
88 | ||
25888dc5 JC |
89 | int sca3000_read_data_short(struct sca3000_state *st, |
90 | uint8_t reg_address_high, | |
91 | int len) | |
574fb258 | 92 | { |
574fb258 | 93 | struct spi_message msg; |
25888dc5 JC |
94 | struct spi_transfer xfer[2] = { |
95 | { | |
96 | .len = 1, | |
97 | .tx_buf = st->tx, | |
98 | }, { | |
99 | .len = len, | |
100 | .rx_buf = st->rx, | |
101 | } | |
574fb258 | 102 | }; |
574fb258 JC |
103 | st->tx[0] = SCA3000_READ_REG(reg_address_high); |
104 | spi_message_init(&msg); | |
25888dc5 JC |
105 | spi_message_add_tail(&xfer[0], &msg); |
106 | spi_message_add_tail(&xfer[1], &msg); | |
574fb258 | 107 | |
25888dc5 | 108 | return spi_sync(st->us, &msg); |
574fb258 | 109 | } |
25888dc5 | 110 | |
574fb258 JC |
111 | /** |
112 | * sca3000_reg_lock_on() test if the ctrl register lock is on | |
113 | * | |
114 | * Lock must be held. | |
115 | **/ | |
116 | static int sca3000_reg_lock_on(struct sca3000_state *st) | |
117 | { | |
574fb258 JC |
118 | int ret; |
119 | ||
25888dc5 | 120 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_STATUS, 1); |
574fb258 JC |
121 | if (ret < 0) |
122 | return ret; | |
574fb258 | 123 | |
25888dc5 | 124 | return !(st->rx[0] & SCA3000_LOCKED); |
574fb258 JC |
125 | } |
126 | ||
127 | /** | |
128 | * __sca3000_unlock_reg_lock() unlock the control registers | |
129 | * | |
130 | * Note the device does not appear to support doing this in a single transfer. | |
131 | * This should only ever be used as part of ctrl reg read. | |
132 | * Lock must be held before calling this | |
133 | **/ | |
134 | static int __sca3000_unlock_reg_lock(struct sca3000_state *st) | |
135 | { | |
136 | struct spi_message msg; | |
137 | struct spi_transfer xfer[3] = { | |
138 | { | |
574fb258 JC |
139 | .len = 2, |
140 | .cs_change = 1, | |
141 | .tx_buf = st->tx, | |
142 | }, { | |
574fb258 JC |
143 | .len = 2, |
144 | .cs_change = 1, | |
145 | .tx_buf = st->tx + 2, | |
146 | }, { | |
574fb258 | 147 | .len = 2, |
574fb258 JC |
148 | .tx_buf = st->tx + 4, |
149 | }, | |
150 | }; | |
151 | st->tx[0] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK); | |
152 | st->tx[1] = 0x00; | |
153 | st->tx[2] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK); | |
154 | st->tx[3] = 0x50; | |
155 | st->tx[4] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK); | |
156 | st->tx[5] = 0xA0; | |
157 | spi_message_init(&msg); | |
158 | spi_message_add_tail(&xfer[0], &msg); | |
159 | spi_message_add_tail(&xfer[1], &msg); | |
160 | spi_message_add_tail(&xfer[2], &msg); | |
161 | ||
162 | return spi_sync(st->us, &msg); | |
163 | } | |
164 | ||
165 | /** | |
166 | * sca3000_write_ctrl_reg() write to a lock protect ctrl register | |
167 | * @sel: selects which registers we wish to write to | |
168 | * @val: the value to be written | |
169 | * | |
170 | * Certain control registers are protected against overwriting by the lock | |
171 | * register and use a shared write address. This function allows writing of | |
172 | * these registers. | |
173 | * Lock must be held. | |
174 | **/ | |
175 | static int sca3000_write_ctrl_reg(struct sca3000_state *st, | |
176 | uint8_t sel, | |
177 | uint8_t val) | |
178 | { | |
179 | ||
180 | int ret; | |
181 | ||
182 | ret = sca3000_reg_lock_on(st); | |
183 | if (ret < 0) | |
184 | goto error_ret; | |
185 | if (ret) { | |
186 | ret = __sca3000_unlock_reg_lock(st); | |
187 | if (ret) | |
188 | goto error_ret; | |
189 | } | |
190 | ||
191 | /* Set the control select register */ | |
192 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_CTRL_SEL, sel); | |
193 | if (ret) | |
194 | goto error_ret; | |
195 | ||
196 | /* Write the actual value into the register */ | |
197 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_CTRL_DATA, val); | |
198 | ||
199 | error_ret: | |
200 | return ret; | |
201 | } | |
202 | ||
203 | /* Crucial that lock is called before calling this */ | |
204 | /** | |
205 | * sca3000_read_ctrl_reg() read from lock protected control register. | |
206 | * | |
207 | * Lock must be held. | |
208 | **/ | |
209 | static int sca3000_read_ctrl_reg(struct sca3000_state *st, | |
25888dc5 | 210 | u8 ctrl_reg) |
574fb258 JC |
211 | { |
212 | int ret; | |
213 | ||
214 | ret = sca3000_reg_lock_on(st); | |
215 | if (ret < 0) | |
216 | goto error_ret; | |
217 | if (ret) { | |
218 | ret = __sca3000_unlock_reg_lock(st); | |
219 | if (ret) | |
220 | goto error_ret; | |
221 | } | |
222 | /* Set the control select register */ | |
223 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_CTRL_SEL, ctrl_reg); | |
224 | if (ret) | |
225 | goto error_ret; | |
25888dc5 JC |
226 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_CTRL_DATA, 1); |
227 | if (ret) | |
228 | goto error_ret; | |
229 | else | |
230 | return st->rx[0]; | |
574fb258 JC |
231 | error_ret: |
232 | return ret; | |
233 | } | |
234 | ||
235 | #ifdef SCA3000_DEBUG | |
236 | /** | |
237 | * sca3000_check_status() check the status register | |
238 | * | |
239 | * Only used for debugging purposes | |
240 | **/ | |
241 | static int sca3000_check_status(struct device *dev) | |
242 | { | |
574fb258 | 243 | int ret; |
4b522ce7 | 244 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
83f0422d | 245 | struct sca3000_state *st = iio_priv(indio_dev); |
574fb258 JC |
246 | |
247 | mutex_lock(&st->lock); | |
25888dc5 | 248 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_STATUS, 1); |
574fb258 JC |
249 | if (ret < 0) |
250 | goto error_ret; | |
25888dc5 | 251 | if (st->rx[0] & SCA3000_EEPROM_CS_ERROR) |
26de7208 | 252 | dev_err(dev, "eeprom error\n"); |
25888dc5 | 253 | if (st->rx[0] & SCA3000_SPI_FRAME_ERROR) |
574fb258 | 254 | dev_err(dev, "Previous SPI Frame was corrupt\n"); |
574fb258 JC |
255 | |
256 | error_ret: | |
257 | mutex_unlock(&st->lock); | |
258 | return ret; | |
259 | } | |
260 | #endif /* SCA3000_DEBUG */ | |
261 | ||
845bd12a | 262 | |
574fb258 JC |
263 | /** |
264 | * sca3000_show_reg() - sysfs interface to read the chip revision number | |
265 | **/ | |
266 | static ssize_t sca3000_show_rev(struct device *dev, | |
267 | struct device_attribute *attr, | |
268 | char *buf) | |
269 | { | |
270 | int len = 0, ret; | |
4b522ce7 | 271 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
2579a0df | 272 | struct sca3000_state *st = iio_priv(indio_dev); |
574fb258 | 273 | |
574fb258 | 274 | mutex_lock(&st->lock); |
25888dc5 | 275 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_REVID, 1); |
574fb258 JC |
276 | if (ret < 0) |
277 | goto error_ret; | |
278 | len += sprintf(buf + len, | |
279 | "major=%d, minor=%d\n", | |
25888dc5 JC |
280 | st->rx[0] & SCA3000_REVID_MAJOR_MASK, |
281 | st->rx[0] & SCA3000_REVID_MINOR_MASK); | |
574fb258 JC |
282 | error_ret: |
283 | mutex_unlock(&st->lock); | |
284 | ||
285 | return ret ? ret : len; | |
286 | } | |
287 | ||
288 | /** | |
289 | * sca3000_show_available_measurement_modes() display available modes | |
290 | * | |
291 | * This is all read from chip specific data in the driver. Not all | |
292 | * of the sca3000 series support modes other than normal. | |
293 | **/ | |
294 | static ssize_t | |
295 | sca3000_show_available_measurement_modes(struct device *dev, | |
296 | struct device_attribute *attr, | |
297 | char *buf) | |
298 | { | |
4b522ce7 | 299 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
2579a0df | 300 | struct sca3000_state *st = iio_priv(indio_dev); |
574fb258 JC |
301 | int len = 0; |
302 | ||
303 | len += sprintf(buf + len, "0 - normal mode"); | |
304 | switch (st->info->option_mode_1) { | |
305 | case SCA3000_OP_MODE_NARROW: | |
306 | len += sprintf(buf + len, ", 1 - narrow mode"); | |
307 | break; | |
308 | case SCA3000_OP_MODE_BYPASS: | |
309 | len += sprintf(buf + len, ", 1 - bypass mode"); | |
310 | break; | |
c608cb01 | 311 | } |
574fb258 JC |
312 | switch (st->info->option_mode_2) { |
313 | case SCA3000_OP_MODE_WIDE: | |
314 | len += sprintf(buf + len, ", 2 - wide mode"); | |
315 | break; | |
316 | } | |
317 | /* always supported */ | |
26de7208 | 318 | len += sprintf(buf + len, " 3 - motion detection\n"); |
574fb258 JC |
319 | |
320 | return len; | |
321 | } | |
322 | ||
323 | /** | |
324 | * sca3000_show_measurmenet_mode() sysfs read of current mode | |
325 | **/ | |
326 | static ssize_t | |
327 | sca3000_show_measurement_mode(struct device *dev, | |
328 | struct device_attribute *attr, | |
329 | char *buf) | |
330 | { | |
4b522ce7 | 331 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
2579a0df | 332 | struct sca3000_state *st = iio_priv(indio_dev); |
574fb258 | 333 | int len = 0, ret; |
574fb258 JC |
334 | |
335 | mutex_lock(&st->lock); | |
25888dc5 | 336 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
337 | if (ret) |
338 | goto error_ret; | |
339 | /* mask bottom 2 bits - only ones that are relevant */ | |
25888dc5 JC |
340 | st->rx[0] &= 0x03; |
341 | switch (st->rx[0]) { | |
574fb258 JC |
342 | case SCA3000_MEAS_MODE_NORMAL: |
343 | len += sprintf(buf + len, "0 - normal mode\n"); | |
344 | break; | |
345 | case SCA3000_MEAS_MODE_MOT_DET: | |
346 | len += sprintf(buf + len, "3 - motion detection\n"); | |
347 | break; | |
348 | case SCA3000_MEAS_MODE_OP_1: | |
349 | switch (st->info->option_mode_1) { | |
350 | case SCA3000_OP_MODE_NARROW: | |
351 | len += sprintf(buf + len, "1 - narrow mode\n"); | |
352 | break; | |
353 | case SCA3000_OP_MODE_BYPASS: | |
354 | len += sprintf(buf + len, "1 - bypass mode\n"); | |
355 | break; | |
c608cb01 | 356 | } |
574fb258 JC |
357 | break; |
358 | case SCA3000_MEAS_MODE_OP_2: | |
359 | switch (st->info->option_mode_2) { | |
360 | case SCA3000_OP_MODE_WIDE: | |
361 | len += sprintf(buf + len, "2 - wide mode\n"); | |
362 | break; | |
363 | } | |
364 | break; | |
c608cb01 | 365 | } |
574fb258 JC |
366 | |
367 | error_ret: | |
368 | mutex_unlock(&st->lock); | |
369 | ||
370 | return ret ? ret : len; | |
371 | } | |
372 | ||
373 | /** | |
374 | * sca3000_store_measurement_mode() set the current mode | |
375 | **/ | |
376 | static ssize_t | |
377 | sca3000_store_measurement_mode(struct device *dev, | |
378 | struct device_attribute *attr, | |
379 | const char *buf, | |
380 | size_t len) | |
381 | { | |
4b522ce7 | 382 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
2579a0df | 383 | struct sca3000_state *st = iio_priv(indio_dev); |
574fb258 | 384 | int ret; |
bba42776 | 385 | u8 mask = 0x03; |
3b724ca1 | 386 | u8 val; |
574fb258 JC |
387 | |
388 | mutex_lock(&st->lock); | |
3b724ca1 | 389 | ret = kstrtou8(buf, 10, &val); |
574fb258 JC |
390 | if (ret) |
391 | goto error_ret; | |
d666c0d4 AR |
392 | if (val > 3) { |
393 | ret = -EINVAL; | |
394 | goto error_ret; | |
395 | } | |
25888dc5 | 396 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
397 | if (ret) |
398 | goto error_ret; | |
25888dc5 JC |
399 | st->rx[0] &= ~mask; |
400 | st->rx[0] |= (val & mask); | |
401 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, st->rx[0]); | |
574fb258 | 402 | if (ret) |
25888dc5 | 403 | goto error_ret; |
574fb258 JC |
404 | mutex_unlock(&st->lock); |
405 | ||
406 | return len; | |
407 | ||
574fb258 JC |
408 | error_ret: |
409 | mutex_unlock(&st->lock); | |
410 | ||
411 | return ret; | |
412 | } | |
413 | ||
414 | ||
415 | /* Not even vaguely standard attributes so defined here rather than | |
416 | * in the relevant IIO core headers | |
417 | */ | |
f3fb0011 | 418 | static IIO_DEVICE_ATTR(measurement_mode_available, S_IRUGO, |
574fb258 JC |
419 | sca3000_show_available_measurement_modes, |
420 | NULL, 0); | |
421 | ||
422 | static IIO_DEVICE_ATTR(measurement_mode, S_IRUGO | S_IWUSR, | |
423 | sca3000_show_measurement_mode, | |
424 | sca3000_store_measurement_mode, | |
425 | 0); | |
426 | ||
427 | /* More standard attributes */ | |
428 | ||
355e25c1 | 429 | static IIO_DEVICE_ATTR(revision, S_IRUGO, sca3000_show_rev, NULL, 0); |
574fb258 | 430 | |
25888dc5 | 431 | #define SCA3000_INFO_MASK \ |
31313fc6 | 432 | IIO_CHAN_INFO_RAW_SEPARATE_BIT | IIO_CHAN_INFO_SCALE_SHARED_BIT |
25888dc5 JC |
433 | #define SCA3000_EVENT_MASK \ |
434 | (IIO_EV_BIT(IIO_EV_TYPE_MAG, IIO_EV_DIR_RISING)) | |
435 | ||
691a4ca1 JC |
436 | #define SCA3000_CHAN(index, mod) \ |
437 | { \ | |
438 | .type = IIO_ACCEL, \ | |
439 | .modified = 1, \ | |
440 | .channel2 = mod, \ | |
441 | .info_mask = SCA3000_INFO_MASK, \ | |
442 | .address = index, \ | |
443 | .scan_index = index, \ | |
444 | .scan_type = { \ | |
445 | .sign = 's', \ | |
446 | .realbits = 11, \ | |
447 | .storagebits = 16, \ | |
448 | .shift = 5, \ | |
449 | }, \ | |
450 | .event_mask = SCA3000_EVENT_MASK, \ | |
451 | } | |
452 | ||
f4e4b955 | 453 | static const struct iio_chan_spec sca3000_channels[] = { |
691a4ca1 JC |
454 | SCA3000_CHAN(0, IIO_MOD_X), |
455 | SCA3000_CHAN(1, IIO_MOD_Y), | |
456 | SCA3000_CHAN(2, IIO_MOD_Z), | |
25888dc5 | 457 | }; |
574fb258 | 458 | |
25888dc5 JC |
459 | static u8 sca3000_addresses[3][3] = { |
460 | [0] = {SCA3000_REG_ADDR_X_MSB, SCA3000_REG_CTRL_SEL_MD_X_TH, | |
461 | SCA3000_MD_CTRL_OR_X}, | |
462 | [1] = {SCA3000_REG_ADDR_Y_MSB, SCA3000_REG_CTRL_SEL_MD_Y_TH, | |
463 | SCA3000_MD_CTRL_OR_Y}, | |
464 | [2] = {SCA3000_REG_ADDR_Z_MSB, SCA3000_REG_CTRL_SEL_MD_Z_TH, | |
465 | SCA3000_MD_CTRL_OR_Z}, | |
466 | }; | |
467 | ||
468 | static int sca3000_read_raw(struct iio_dev *indio_dev, | |
469 | struct iio_chan_spec const *chan, | |
470 | int *val, | |
471 | int *val2, | |
472 | long mask) | |
473 | { | |
83f0422d | 474 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 JC |
475 | int ret; |
476 | u8 address; | |
477 | ||
478 | switch (mask) { | |
31313fc6 | 479 | case IIO_CHAN_INFO_RAW: |
25888dc5 JC |
480 | mutex_lock(&st->lock); |
481 | if (st->mo_det_use_count) { | |
482 | mutex_unlock(&st->lock); | |
483 | return -EBUSY; | |
484 | } | |
485 | address = sca3000_addresses[chan->address][0]; | |
486 | ret = sca3000_read_data_short(st, address, 2); | |
487 | if (ret < 0) { | |
488 | mutex_unlock(&st->lock); | |
489 | return ret; | |
490 | } | |
491 | *val = (be16_to_cpup((__be16 *)st->rx) >> 3) & 0x1FFF; | |
492 | *val = ((*val) << (sizeof(*val)*8 - 13)) >> | |
493 | (sizeof(*val)*8 - 13); | |
494 | mutex_unlock(&st->lock); | |
495 | return IIO_VAL_INT; | |
c8a9f805 | 496 | case IIO_CHAN_INFO_SCALE: |
25888dc5 JC |
497 | *val = 0; |
498 | if (chan->type == IIO_ACCEL) | |
499 | *val2 = st->info->scale; | |
500 | else /* temperature */ | |
501 | *val2 = 555556; | |
502 | return IIO_VAL_INT_PLUS_MICRO; | |
503 | default: | |
504 | return -EINVAL; | |
505 | } | |
506 | } | |
574fb258 JC |
507 | |
508 | /** | |
509 | * sca3000_read_av_freq() sysfs function to get available frequencies | |
510 | * | |
511 | * The later modes are only relevant to the ring buffer - and depend on current | |
512 | * mode. Note that data sheet gives rather wide tolerances for these so integer | |
513 | * division will give good enough answer and not all chips have them specified | |
514 | * at all. | |
515 | **/ | |
516 | static ssize_t sca3000_read_av_freq(struct device *dev, | |
517 | struct device_attribute *attr, | |
518 | char *buf) | |
519 | { | |
4b522ce7 | 520 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
83f0422d | 521 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 JC |
522 | int len = 0, ret, val; |
523 | ||
574fb258 | 524 | mutex_lock(&st->lock); |
25888dc5 JC |
525 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
526 | val = st->rx[0]; | |
574fb258 JC |
527 | mutex_unlock(&st->lock); |
528 | if (ret) | |
529 | goto error_ret; | |
25888dc5 JC |
530 | |
531 | switch (val & 0x03) { | |
574fb258 JC |
532 | case SCA3000_MEAS_MODE_NORMAL: |
533 | len += sprintf(buf + len, "%d %d %d\n", | |
534 | st->info->measurement_mode_freq, | |
535 | st->info->measurement_mode_freq/2, | |
536 | st->info->measurement_mode_freq/4); | |
537 | break; | |
538 | case SCA3000_MEAS_MODE_OP_1: | |
539 | len += sprintf(buf + len, "%d %d %d\n", | |
540 | st->info->option_mode_1_freq, | |
541 | st->info->option_mode_1_freq/2, | |
542 | st->info->option_mode_1_freq/4); | |
543 | break; | |
544 | case SCA3000_MEAS_MODE_OP_2: | |
545 | len += sprintf(buf + len, "%d %d %d\n", | |
546 | st->info->option_mode_2_freq, | |
547 | st->info->option_mode_2_freq/2, | |
548 | st->info->option_mode_2_freq/4); | |
549 | break; | |
c608cb01 | 550 | } |
574fb258 JC |
551 | return len; |
552 | error_ret: | |
553 | return ret; | |
554 | } | |
555 | /** | |
556 | * __sca3000_get_base_frequency() obtain mode specific base frequency | |
557 | * | |
558 | * lock must be held | |
559 | **/ | |
560 | static inline int __sca3000_get_base_freq(struct sca3000_state *st, | |
561 | const struct sca3000_chip_info *info, | |
562 | int *base_freq) | |
563 | { | |
564 | int ret; | |
574fb258 | 565 | |
25888dc5 | 566 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
567 | if (ret) |
568 | goto error_ret; | |
25888dc5 | 569 | switch (0x03 & st->rx[0]) { |
574fb258 JC |
570 | case SCA3000_MEAS_MODE_NORMAL: |
571 | *base_freq = info->measurement_mode_freq; | |
572 | break; | |
573 | case SCA3000_MEAS_MODE_OP_1: | |
574 | *base_freq = info->option_mode_1_freq; | |
575 | break; | |
576 | case SCA3000_MEAS_MODE_OP_2: | |
577 | *base_freq = info->option_mode_2_freq; | |
578 | break; | |
c608cb01 | 579 | } |
574fb258 JC |
580 | error_ret: |
581 | return ret; | |
582 | } | |
583 | ||
584 | /** | |
585 | * sca3000_read_frequency() sysfs interface to get the current frequency | |
586 | **/ | |
587 | static ssize_t sca3000_read_frequency(struct device *dev, | |
588 | struct device_attribute *attr, | |
589 | char *buf) | |
590 | { | |
4b522ce7 | 591 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
83f0422d | 592 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 JC |
593 | int ret, len = 0, base_freq = 0, val; |
594 | ||
574fb258 JC |
595 | mutex_lock(&st->lock); |
596 | ret = __sca3000_get_base_freq(st, st->info, &base_freq); | |
597 | if (ret) | |
598 | goto error_ret_mut; | |
25888dc5 | 599 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL); |
574fb258 JC |
600 | mutex_unlock(&st->lock); |
601 | if (ret) | |
602 | goto error_ret; | |
25888dc5 | 603 | val = ret; |
574fb258 | 604 | if (base_freq > 0) |
25888dc5 | 605 | switch (val & 0x03) { |
574fb258 JC |
606 | case 0x00: |
607 | case 0x03: | |
608 | len = sprintf(buf, "%d\n", base_freq); | |
609 | break; | |
610 | case 0x01: | |
611 | len = sprintf(buf, "%d\n", base_freq/2); | |
612 | break; | |
613 | case 0x02: | |
614 | len = sprintf(buf, "%d\n", base_freq/4); | |
615 | break; | |
c608cb01 | 616 | } |
25888dc5 | 617 | |
574fb258 JC |
618 | return len; |
619 | error_ret_mut: | |
620 | mutex_unlock(&st->lock); | |
621 | error_ret: | |
622 | return ret; | |
623 | } | |
624 | ||
625 | /** | |
626 | * sca3000_set_frequency() sysfs interface to set the current frequency | |
627 | **/ | |
628 | static ssize_t sca3000_set_frequency(struct device *dev, | |
629 | struct device_attribute *attr, | |
630 | const char *buf, | |
631 | size_t len) | |
632 | { | |
4b522ce7 | 633 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
83f0422d | 634 | struct sca3000_state *st = iio_priv(indio_dev); |
574fb258 | 635 | int ret, base_freq = 0; |
25888dc5 | 636 | int ctrlval; |
574fb258 JC |
637 | long val; |
638 | ||
639 | ret = strict_strtol(buf, 10, &val); | |
640 | if (ret) | |
641 | return ret; | |
642 | ||
643 | mutex_lock(&st->lock); | |
644 | /* What mode are we in? */ | |
645 | ret = __sca3000_get_base_freq(st, st->info, &base_freq); | |
646 | if (ret) | |
647 | goto error_free_lock; | |
648 | ||
25888dc5 JC |
649 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL); |
650 | if (ret < 0) | |
574fb258 | 651 | goto error_free_lock; |
25888dc5 | 652 | ctrlval = ret; |
574fb258 | 653 | /* clear the bits */ |
25888dc5 | 654 | ctrlval &= ~0x03; |
574fb258 JC |
655 | |
656 | if (val == base_freq/2) { | |
25888dc5 | 657 | ctrlval |= SCA3000_OUT_CTRL_BUF_DIV_2; |
574fb258 | 658 | } else if (val == base_freq/4) { |
25888dc5 | 659 | ctrlval |= SCA3000_OUT_CTRL_BUF_DIV_4; |
574fb258 JC |
660 | } else if (val != base_freq) { |
661 | ret = -EINVAL; | |
662 | goto error_free_lock; | |
663 | } | |
25888dc5 JC |
664 | ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL, |
665 | ctrlval); | |
574fb258 JC |
666 | error_free_lock: |
667 | mutex_unlock(&st->lock); | |
668 | ||
669 | return ret ? ret : len; | |
670 | } | |
671 | ||
672 | /* Should only really be registered if ring buffer support is compiled in. | |
673 | * Does no harm however and doing it right would add a fair bit of complexity | |
674 | */ | |
f3fb0011 | 675 | static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(sca3000_read_av_freq); |
574fb258 JC |
676 | |
677 | static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO, | |
678 | sca3000_read_frequency, | |
679 | sca3000_set_frequency); | |
680 | ||
681 | ||
682 | /** | |
683 | * sca3000_read_temp() sysfs interface to get the temperature when available | |
684 | * | |
685 | * The alignment of data in here is downright odd. See data sheet. | |
686 | * Converting this into a meaningful value is left to inline functions in | |
687 | * userspace part of header. | |
688 | **/ | |
689 | static ssize_t sca3000_read_temp(struct device *dev, | |
690 | struct device_attribute *attr, | |
691 | char *buf) | |
692 | { | |
4b522ce7 | 693 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
83f0422d | 694 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 | 695 | int ret; |
574fb258 | 696 | int val; |
25888dc5 | 697 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_TEMP_MSB, 2); |
574fb258 JC |
698 | if (ret < 0) |
699 | goto error_ret; | |
25888dc5 | 700 | val = ((st->rx[0] & 0x3F) << 3) | ((st->rx[1] & 0xE0) >> 5); |
574fb258 | 701 | |
25888dc5 | 702 | return sprintf(buf, "%d\n", val); |
574fb258 JC |
703 | |
704 | error_ret: | |
705 | return ret; | |
706 | } | |
f3fb0011 JC |
707 | static IIO_DEV_ATTR_TEMP_RAW(sca3000_read_temp); |
708 | ||
51a0a5b0 MS |
709 | static IIO_CONST_ATTR_TEMP_SCALE("0.555556"); |
710 | static IIO_CONST_ATTR_TEMP_OFFSET("-214.6"); | |
574fb258 JC |
711 | |
712 | /** | |
25888dc5 | 713 | * sca3000_read_thresh() - query of a threshold |
574fb258 | 714 | **/ |
25888dc5 | 715 | static int sca3000_read_thresh(struct iio_dev *indio_dev, |
330c6c57 | 716 | u64 e, |
25888dc5 | 717 | int *val) |
574fb258 | 718 | { |
25888dc5 | 719 | int ret, i; |
83f0422d | 720 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 | 721 | int num = IIO_EVENT_CODE_EXTRACT_MODIFIER(e); |
574fb258 | 722 | mutex_lock(&st->lock); |
25888dc5 | 723 | ret = sca3000_read_ctrl_reg(st, sca3000_addresses[num][1]); |
574fb258 | 724 | mutex_unlock(&st->lock); |
25888dc5 | 725 | if (ret < 0) |
574fb258 | 726 | return ret; |
25888dc5 JC |
727 | *val = 0; |
728 | if (num == 1) | |
729 | for_each_set_bit(i, (unsigned long *)&ret, | |
730 | ARRAY_SIZE(st->info->mot_det_mult_y)) | |
731 | *val += st->info->mot_det_mult_y[i]; | |
732 | else | |
733 | for_each_set_bit(i, (unsigned long *)&ret, | |
734 | ARRAY_SIZE(st->info->mot_det_mult_xz)) | |
735 | *val += st->info->mot_det_mult_xz[i]; | |
574fb258 | 736 | |
25888dc5 | 737 | return 0; |
574fb258 JC |
738 | } |
739 | ||
740 | /** | |
25888dc5 | 741 | * sca3000_write_thresh() control of threshold |
574fb258 | 742 | **/ |
25888dc5 | 743 | static int sca3000_write_thresh(struct iio_dev *indio_dev, |
330c6c57 JC |
744 | u64 e, |
745 | int val) | |
574fb258 | 746 | { |
83f0422d | 747 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 | 748 | int num = IIO_EVENT_CODE_EXTRACT_MODIFIER(e); |
574fb258 | 749 | int ret; |
25888dc5 JC |
750 | int i; |
751 | u8 nonlinear = 0; | |
752 | ||
753 | if (num == 1) { | |
754 | i = ARRAY_SIZE(st->info->mot_det_mult_y); | |
755 | while (i > 0) | |
756 | if (val >= st->info->mot_det_mult_y[--i]) { | |
757 | nonlinear |= (1 << i); | |
758 | val -= st->info->mot_det_mult_y[i]; | |
759 | } | |
760 | } else { | |
761 | i = ARRAY_SIZE(st->info->mot_det_mult_xz); | |
762 | while (i > 0) | |
763 | if (val >= st->info->mot_det_mult_xz[--i]) { | |
764 | nonlinear |= (1 << i); | |
765 | val -= st->info->mot_det_mult_xz[i]; | |
766 | } | |
767 | } | |
574fb258 | 768 | |
574fb258 | 769 | mutex_lock(&st->lock); |
25888dc5 | 770 | ret = sca3000_write_ctrl_reg(st, sca3000_addresses[num][1], nonlinear); |
574fb258 JC |
771 | mutex_unlock(&st->lock); |
772 | ||
25888dc5 | 773 | return ret; |
574fb258 JC |
774 | } |
775 | ||
574fb258 | 776 | static struct attribute *sca3000_attributes[] = { |
574fb258 | 777 | &iio_dev_attr_revision.dev_attr.attr, |
f3fb0011 | 778 | &iio_dev_attr_measurement_mode_available.dev_attr.attr, |
574fb258 | 779 | &iio_dev_attr_measurement_mode.dev_attr.attr, |
f3fb0011 | 780 | &iio_dev_attr_sampling_frequency_available.dev_attr.attr, |
574fb258 JC |
781 | &iio_dev_attr_sampling_frequency.dev_attr.attr, |
782 | NULL, | |
783 | }; | |
784 | ||
785 | static struct attribute *sca3000_attributes_with_temp[] = { | |
574fb258 | 786 | &iio_dev_attr_revision.dev_attr.attr, |
f3fb0011 | 787 | &iio_dev_attr_measurement_mode_available.dev_attr.attr, |
574fb258 | 788 | &iio_dev_attr_measurement_mode.dev_attr.attr, |
f3fb0011 | 789 | &iio_dev_attr_sampling_frequency_available.dev_attr.attr, |
574fb258 JC |
790 | &iio_dev_attr_sampling_frequency.dev_attr.attr, |
791 | /* Only present if temp sensor is */ | |
322c9563 JC |
792 | &iio_dev_attr_in_temp_raw.dev_attr.attr, |
793 | &iio_const_attr_in_temp_offset.dev_attr.attr, | |
794 | &iio_const_attr_in_temp_scale.dev_attr.attr, | |
574fb258 JC |
795 | NULL, |
796 | }; | |
797 | ||
798 | static const struct attribute_group sca3000_attribute_group = { | |
799 | .attrs = sca3000_attributes, | |
800 | }; | |
801 | ||
802 | static const struct attribute_group sca3000_attribute_group_with_temp = { | |
803 | .attrs = sca3000_attributes_with_temp, | |
804 | }; | |
805 | ||
806 | /* RING RELATED interrupt handler */ | |
807 | /* depending on event, push to the ring buffer event chrdev or the event one */ | |
808 | ||
809 | /** | |
25888dc5 | 810 | * sca3000_event_handler() - handling ring and non ring events |
574fb258 JC |
811 | * |
812 | * This function is complicated by the fact that the devices can signify ring | |
813 | * and non ring events via the same interrupt line and they can only | |
814 | * be distinguished via a read of the relevant status register. | |
815 | **/ | |
25888dc5 | 816 | static irqreturn_t sca3000_event_handler(int irq, void *private) |
574fb258 | 817 | { |
25888dc5 | 818 | struct iio_dev *indio_dev = private; |
83f0422d | 819 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 JC |
820 | int ret, val; |
821 | s64 last_timestamp = iio_get_time_ns(); | |
574fb258 JC |
822 | |
823 | /* Could lead if badly timed to an extra read of status reg, | |
824 | * but ensures no interrupt is missed. | |
825 | */ | |
574fb258 | 826 | mutex_lock(&st->lock); |
25888dc5 JC |
827 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_STATUS, 1); |
828 | val = st->rx[0]; | |
574fb258 JC |
829 | mutex_unlock(&st->lock); |
830 | if (ret) | |
831 | goto done; | |
832 | ||
14555b14 | 833 | sca3000_ring_int_process(val, indio_dev->buffer); |
574fb258 | 834 | |
25888dc5 | 835 | if (val & SCA3000_INT_STATUS_FREE_FALL) |
5aa96188 | 836 | iio_push_event(indio_dev, |
c4b14d99 | 837 | IIO_MOD_EVENT_CODE(IIO_ACCEL, |
de9fe32a | 838 | 0, |
c4b14d99 | 839 | IIO_MOD_X_AND_Y_AND_Z, |
de9fe32a JC |
840 | IIO_EV_TYPE_MAG, |
841 | IIO_EV_DIR_FALLING), | |
25888dc5 | 842 | last_timestamp); |
574fb258 | 843 | |
25888dc5 | 844 | if (val & SCA3000_INT_STATUS_Y_TRIGGER) |
5aa96188 | 845 | iio_push_event(indio_dev, |
c4b14d99 | 846 | IIO_MOD_EVENT_CODE(IIO_ACCEL, |
de9fe32a | 847 | 0, |
c4b14d99 | 848 | IIO_MOD_Y, |
de9fe32a JC |
849 | IIO_EV_TYPE_MAG, |
850 | IIO_EV_DIR_RISING), | |
25888dc5 | 851 | last_timestamp); |
574fb258 | 852 | |
25888dc5 | 853 | if (val & SCA3000_INT_STATUS_X_TRIGGER) |
5aa96188 | 854 | iio_push_event(indio_dev, |
c4b14d99 | 855 | IIO_MOD_EVENT_CODE(IIO_ACCEL, |
de9fe32a | 856 | 0, |
c4b14d99 | 857 | IIO_MOD_X, |
de9fe32a JC |
858 | IIO_EV_TYPE_MAG, |
859 | IIO_EV_DIR_RISING), | |
25888dc5 | 860 | last_timestamp); |
574fb258 | 861 | |
25888dc5 | 862 | if (val & SCA3000_INT_STATUS_Z_TRIGGER) |
5aa96188 | 863 | iio_push_event(indio_dev, |
c4b14d99 | 864 | IIO_MOD_EVENT_CODE(IIO_ACCEL, |
de9fe32a | 865 | 0, |
c4b14d99 | 866 | IIO_MOD_Z, |
de9fe32a JC |
867 | IIO_EV_TYPE_MAG, |
868 | IIO_EV_DIR_RISING), | |
25888dc5 | 869 | last_timestamp); |
574fb258 JC |
870 | |
871 | done: | |
25888dc5 | 872 | return IRQ_HANDLED; |
574fb258 JC |
873 | } |
874 | ||
875 | /** | |
25888dc5 | 876 | * sca3000_read_event_config() what events are enabled |
574fb258 | 877 | **/ |
25888dc5 | 878 | static int sca3000_read_event_config(struct iio_dev *indio_dev, |
330c6c57 | 879 | u64 e) |
574fb258 | 880 | { |
83f0422d | 881 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 | 882 | int ret; |
574fb258 | 883 | u8 protect_mask = 0x03; |
25888dc5 | 884 | int num = IIO_EVENT_CODE_EXTRACT_MODIFIER(e); |
574fb258 JC |
885 | |
886 | /* read current value of mode register */ | |
887 | mutex_lock(&st->lock); | |
25888dc5 | 888 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
889 | if (ret) |
890 | goto error_ret; | |
891 | ||
25888dc5 JC |
892 | if ((st->rx[0] & protect_mask) != SCA3000_MEAS_MODE_MOT_DET) |
893 | ret = 0; | |
574fb258 | 894 | else { |
25888dc5 JC |
895 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL); |
896 | if (ret < 0) | |
574fb258 JC |
897 | goto error_ret; |
898 | /* only supporting logical or's for now */ | |
25888dc5 | 899 | ret = !!(ret & sca3000_addresses[num][2]); |
574fb258 | 900 | } |
574fb258 JC |
901 | error_ret: |
902 | mutex_unlock(&st->lock); | |
903 | ||
25888dc5 | 904 | return ret; |
574fb258 JC |
905 | } |
906 | /** | |
907 | * sca3000_query_free_fall_mode() is free fall mode enabled | |
908 | **/ | |
909 | static ssize_t sca3000_query_free_fall_mode(struct device *dev, | |
910 | struct device_attribute *attr, | |
911 | char *buf) | |
912 | { | |
913 | int ret, len; | |
4b522ce7 | 914 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
83f0422d | 915 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 | 916 | int val; |
574fb258 JC |
917 | |
918 | mutex_lock(&st->lock); | |
25888dc5 JC |
919 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
920 | val = st->rx[0]; | |
574fb258 | 921 | mutex_unlock(&st->lock); |
25888dc5 | 922 | if (ret < 0) |
574fb258 JC |
923 | return ret; |
924 | len = sprintf(buf, "%d\n", | |
25888dc5 | 925 | !!(val & SCA3000_FREE_FALL_DETECT)); |
574fb258 JC |
926 | return len; |
927 | } | |
574fb258 JC |
928 | |
929 | /** | |
930 | * sca3000_set_free_fall_mode() simple on off control for free fall int | |
931 | * | |
932 | * In these chips the free fall detector should send an interrupt if | |
933 | * the device falls more than 25cm. This has not been tested due | |
934 | * to fragile wiring. | |
935 | **/ | |
936 | ||
937 | static ssize_t sca3000_set_free_fall_mode(struct device *dev, | |
938 | struct device_attribute *attr, | |
939 | const char *buf, | |
940 | size_t len) | |
941 | { | |
4b522ce7 | 942 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
83f0422d | 943 | struct sca3000_state *st = iio_priv(indio_dev); |
574fb258 JC |
944 | long val; |
945 | int ret; | |
574fb258 JC |
946 | u8 protect_mask = SCA3000_FREE_FALL_DETECT; |
947 | ||
948 | mutex_lock(&st->lock); | |
949 | ret = strict_strtol(buf, 10, &val); | |
950 | if (ret) | |
951 | goto error_ret; | |
952 | ||
953 | /* read current value of mode register */ | |
25888dc5 | 954 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
955 | if (ret) |
956 | goto error_ret; | |
957 | ||
958 | /*if off and should be on*/ | |
25888dc5 | 959 | if (val && !(st->rx[0] & protect_mask)) |
574fb258 | 960 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
25888dc5 | 961 | (st->rx[0] | SCA3000_FREE_FALL_DETECT)); |
574fb258 | 962 | /* if on and should be off */ |
25888dc5 | 963 | else if (!val && (st->rx[0] & protect_mask)) |
574fb258 | 964 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
25888dc5 | 965 | (st->rx[0] & ~protect_mask)); |
574fb258 JC |
966 | error_ret: |
967 | mutex_unlock(&st->lock); | |
968 | ||
969 | return ret ? ret : len; | |
970 | } | |
971 | ||
972 | /** | |
973 | * sca3000_set_mo_det() simple on off control for motion detector | |
974 | * | |
975 | * This is a per axis control, but enabling any will result in the | |
976 | * motion detector unit being enabled. | |
977 | * N.B. enabling motion detector stops normal data acquisition. | |
978 | * There is a complexity in knowing which mode to return to when | |
979 | * this mode is disabled. Currently normal mode is assumed. | |
980 | **/ | |
25888dc5 | 981 | static int sca3000_write_event_config(struct iio_dev *indio_dev, |
330c6c57 | 982 | u64 e, |
25888dc5 | 983 | int state) |
574fb258 | 984 | { |
83f0422d | 985 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 | 986 | int ret, ctrlval; |
574fb258 | 987 | u8 protect_mask = 0x03; |
25888dc5 | 988 | int num = IIO_EVENT_CODE_EXTRACT_MODIFIER(e); |
574fb258 JC |
989 | |
990 | mutex_lock(&st->lock); | |
991 | /* First read the motion detector config to find out if | |
992 | * this axis is on*/ | |
25888dc5 JC |
993 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL); |
994 | if (ret < 0) | |
574fb258 | 995 | goto exit_point; |
25888dc5 | 996 | ctrlval = ret; |
574fb258 | 997 | /* Off and should be on */ |
25888dc5 | 998 | if (state && !(ctrlval & sca3000_addresses[num][2])) { |
574fb258 JC |
999 | ret = sca3000_write_ctrl_reg(st, |
1000 | SCA3000_REG_CTRL_SEL_MD_CTRL, | |
25888dc5 JC |
1001 | ctrlval | |
1002 | sca3000_addresses[num][2]); | |
574fb258 | 1003 | if (ret) |
25888dc5 | 1004 | goto exit_point; |
574fb258 | 1005 | st->mo_det_use_count++; |
25888dc5 | 1006 | } else if (!state && (ctrlval & sca3000_addresses[num][2])) { |
574fb258 JC |
1007 | ret = sca3000_write_ctrl_reg(st, |
1008 | SCA3000_REG_CTRL_SEL_MD_CTRL, | |
25888dc5 JC |
1009 | ctrlval & |
1010 | ~(sca3000_addresses[num][2])); | |
574fb258 | 1011 | if (ret) |
25888dc5 | 1012 | goto exit_point; |
574fb258 | 1013 | st->mo_det_use_count--; |
25888dc5 JC |
1014 | } |
1015 | ||
574fb258 | 1016 | /* read current value of mode register */ |
25888dc5 | 1017 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
1018 | if (ret) |
1019 | goto exit_point; | |
1020 | /*if off and should be on*/ | |
1021 | if ((st->mo_det_use_count) | |
25888dc5 | 1022 | && ((st->rx[0] & protect_mask) != SCA3000_MEAS_MODE_MOT_DET)) |
574fb258 | 1023 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
25888dc5 | 1024 | (st->rx[0] & ~protect_mask) |
574fb258 JC |
1025 | | SCA3000_MEAS_MODE_MOT_DET); |
1026 | /* if on and should be off */ | |
1027 | else if (!(st->mo_det_use_count) | |
25888dc5 | 1028 | && ((st->rx[0] & protect_mask) == SCA3000_MEAS_MODE_MOT_DET)) |
574fb258 | 1029 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
25888dc5 | 1030 | (st->rx[0] & ~protect_mask)); |
574fb258 JC |
1031 | exit_point: |
1032 | mutex_unlock(&st->lock); | |
1033 | ||
25888dc5 | 1034 | return ret; |
574fb258 JC |
1035 | } |
1036 | ||
574fb258 | 1037 | /* Free fall detector related event attribute */ |
aaf370db | 1038 | static IIO_DEVICE_ATTR_NAMED(accel_xayaz_mag_falling_en, |
322c9563 | 1039 | in_accel_x&y&z_mag_falling_en, |
aaf370db JC |
1040 | S_IRUGO | S_IWUSR, |
1041 | sca3000_query_free_fall_mode, | |
1042 | sca3000_set_free_fall_mode, | |
1043 | 0); | |
fc5d0e42 | 1044 | |
25888dc5 | 1045 | static IIO_CONST_ATTR_NAMED(accel_xayaz_mag_falling_period, |
322c9563 | 1046 | in_accel_x&y&z_mag_falling_period, |
25888dc5 | 1047 | "0.226"); |
574fb258 JC |
1048 | |
1049 | static struct attribute *sca3000_event_attributes[] = { | |
aaf370db | 1050 | &iio_dev_attr_accel_xayaz_mag_falling_en.dev_attr.attr, |
fc5d0e42 | 1051 | &iio_const_attr_accel_xayaz_mag_falling_period.dev_attr.attr, |
574fb258 JC |
1052 | NULL, |
1053 | }; | |
1054 | ||
1055 | static struct attribute_group sca3000_event_attribute_group = { | |
1056 | .attrs = sca3000_event_attributes, | |
8e7d9672 | 1057 | .name = "events", |
574fb258 JC |
1058 | }; |
1059 | ||
1060 | /** | |
1061 | * sca3000_clean_setup() get the device into a predictable state | |
1062 | * | |
1063 | * Devices use flash memory to store many of the register values | |
1064 | * and hence can come up in somewhat unpredictable states. | |
1065 | * Hence reset everything on driver load. | |
1066 | **/ | |
1067 | static int sca3000_clean_setup(struct sca3000_state *st) | |
1068 | { | |
1069 | int ret; | |
574fb258 JC |
1070 | |
1071 | mutex_lock(&st->lock); | |
1072 | /* Ensure all interrupts have been acknowledged */ | |
25888dc5 | 1073 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_STATUS, 1); |
574fb258 JC |
1074 | if (ret) |
1075 | goto error_ret; | |
574fb258 JC |
1076 | |
1077 | /* Turn off all motion detection channels */ | |
25888dc5 JC |
1078 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL); |
1079 | if (ret < 0) | |
574fb258 | 1080 | goto error_ret; |
25888dc5 JC |
1081 | ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL, |
1082 | ret & SCA3000_MD_CTRL_PROT_MASK); | |
574fb258 JC |
1083 | if (ret) |
1084 | goto error_ret; | |
1085 | ||
1086 | /* Disable ring buffer */ | |
25888dc5 JC |
1087 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL); |
1088 | ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL, | |
1089 | (ret & SCA3000_OUT_CTRL_PROT_MASK) | |
574fb258 JC |
1090 | | SCA3000_OUT_CTRL_BUF_X_EN |
1091 | | SCA3000_OUT_CTRL_BUF_Y_EN | |
1092 | | SCA3000_OUT_CTRL_BUF_Z_EN | |
1093 | | SCA3000_OUT_CTRL_BUF_DIV_4); | |
574fb258 JC |
1094 | if (ret) |
1095 | goto error_ret; | |
1096 | /* Enable interrupts, relevant to mode and set up as active low */ | |
25888dc5 | 1097 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_MASK, 1); |
574fb258 JC |
1098 | if (ret) |
1099 | goto error_ret; | |
1100 | ret = sca3000_write_reg(st, | |
1101 | SCA3000_REG_ADDR_INT_MASK, | |
25888dc5 | 1102 | (ret & SCA3000_INT_MASK_PROT_MASK) |
574fb258 | 1103 | | SCA3000_INT_MASK_ACTIVE_LOW); |
574fb258 JC |
1104 | if (ret) |
1105 | goto error_ret; | |
1106 | /* Select normal measurement mode, free fall off, ring off */ | |
1107 | /* Ring in 12 bit mode - it is fine to overwrite reserved bits 3,5 | |
1108 | * as that occurs in one of the example on the datasheet */ | |
25888dc5 | 1109 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
1110 | if (ret) |
1111 | goto error_ret; | |
25888dc5 JC |
1112 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
1113 | (st->rx[0] & SCA3000_MODE_PROT_MASK)); | |
574fb258 JC |
1114 | st->bpse = 11; |
1115 | ||
1116 | error_ret: | |
1117 | mutex_unlock(&st->lock); | |
1118 | return ret; | |
1119 | } | |
1120 | ||
6fe8135f JC |
1121 | static const struct iio_info sca3000_info = { |
1122 | .attrs = &sca3000_attribute_group, | |
1123 | .read_raw = &sca3000_read_raw, | |
6fe8135f JC |
1124 | .event_attrs = &sca3000_event_attribute_group, |
1125 | .read_event_value = &sca3000_read_thresh, | |
1126 | .write_event_value = &sca3000_write_thresh, | |
1127 | .read_event_config = &sca3000_read_event_config, | |
1128 | .write_event_config = &sca3000_write_event_config, | |
1129 | .driver_module = THIS_MODULE, | |
1130 | }; | |
1131 | ||
1132 | static const struct iio_info sca3000_info_with_temp = { | |
1133 | .attrs = &sca3000_attribute_group_with_temp, | |
1134 | .read_raw = &sca3000_read_raw, | |
1135 | .read_event_value = &sca3000_read_thresh, | |
1136 | .write_event_value = &sca3000_write_thresh, | |
1137 | .read_event_config = &sca3000_read_event_config, | |
1138 | .write_event_config = &sca3000_write_event_config, | |
1139 | .driver_module = THIS_MODULE, | |
1140 | }; | |
1141 | ||
25888dc5 | 1142 | static int __devinit sca3000_probe(struct spi_device *spi) |
574fb258 | 1143 | { |
d2fffd6c | 1144 | int ret; |
574fb258 | 1145 | struct sca3000_state *st; |
83f0422d | 1146 | struct iio_dev *indio_dev; |
574fb258 | 1147 | |
7cbb7537 | 1148 | indio_dev = iio_device_alloc(sizeof(*st)); |
83f0422d | 1149 | if (indio_dev == NULL) { |
574fb258 JC |
1150 | ret = -ENOMEM; |
1151 | goto error_ret; | |
1152 | } | |
574fb258 | 1153 | |
03bda05d | 1154 | st = iio_priv(indio_dev); |
83f0422d | 1155 | spi_set_drvdata(spi, indio_dev); |
574fb258 JC |
1156 | st->us = spi; |
1157 | mutex_init(&st->lock); | |
25888dc5 JC |
1158 | st->info = &sca3000_spi_chip_info_tbl[spi_get_device_id(spi) |
1159 | ->driver_data]; | |
574fb258 | 1160 | |
83f0422d JC |
1161 | indio_dev->dev.parent = &spi->dev; |
1162 | indio_dev->name = spi_get_device_id(spi)->name; | |
574fb258 | 1163 | if (st->info->temp_output) |
83f0422d | 1164 | indio_dev->info = &sca3000_info_with_temp; |
25888dc5 | 1165 | else { |
83f0422d JC |
1166 | indio_dev->info = &sca3000_info; |
1167 | indio_dev->channels = sca3000_channels; | |
1168 | indio_dev->num_channels = ARRAY_SIZE(sca3000_channels); | |
25888dc5 | 1169 | } |
83f0422d | 1170 | indio_dev->modes = INDIO_DIRECT_MODE; |
574fb258 | 1171 | |
83f0422d JC |
1172 | sca3000_configure_ring(indio_dev); |
1173 | ret = iio_device_register(indio_dev); | |
574fb258 JC |
1174 | if (ret < 0) |
1175 | goto error_free_dev; | |
d2fffd6c | 1176 | |
14555b14 JC |
1177 | ret = iio_buffer_register(indio_dev, |
1178 | sca3000_channels, | |
1179 | ARRAY_SIZE(sca3000_channels)); | |
574fb258 JC |
1180 | if (ret < 0) |
1181 | goto error_unregister_dev; | |
14555b14 | 1182 | if (indio_dev->buffer) { |
f79a9098 JC |
1183 | iio_scan_mask_set(indio_dev, indio_dev->buffer, 0); |
1184 | iio_scan_mask_set(indio_dev, indio_dev->buffer, 1); | |
1185 | iio_scan_mask_set(indio_dev, indio_dev->buffer, 2); | |
bd94c6a8 JC |
1186 | } |
1187 | ||
3e2c96ea | 1188 | if (spi->irq) { |
25888dc5 JC |
1189 | ret = request_threaded_irq(spi->irq, |
1190 | NULL, | |
1191 | &sca3000_event_handler, | |
a91aff1c | 1192 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, |
25888dc5 | 1193 | "sca3000", |
83f0422d | 1194 | indio_dev); |
574fb258 JC |
1195 | if (ret) |
1196 | goto error_unregister_ring; | |
574fb258 | 1197 | } |
83f0422d | 1198 | sca3000_register_ring_funcs(indio_dev); |
574fb258 JC |
1199 | ret = sca3000_clean_setup(st); |
1200 | if (ret) | |
25888dc5 | 1201 | goto error_free_irq; |
574fb258 JC |
1202 | return 0; |
1203 | ||
25888dc5 | 1204 | error_free_irq: |
3e2c96ea | 1205 | if (spi->irq) |
83f0422d | 1206 | free_irq(spi->irq, indio_dev); |
574fb258 | 1207 | error_unregister_ring: |
14555b14 | 1208 | iio_buffer_unregister(indio_dev); |
574fb258 | 1209 | error_unregister_dev: |
d2fffd6c | 1210 | iio_device_unregister(indio_dev); |
574fb258 | 1211 | error_free_dev: |
7cbb7537 | 1212 | iio_device_free(indio_dev); |
83f0422d | 1213 | |
574fb258 JC |
1214 | error_ret: |
1215 | return ret; | |
1216 | } | |
1217 | ||
1218 | static int sca3000_stop_all_interrupts(struct sca3000_state *st) | |
1219 | { | |
1220 | int ret; | |
574fb258 JC |
1221 | |
1222 | mutex_lock(&st->lock); | |
25888dc5 | 1223 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_MASK, 1); |
574fb258 JC |
1224 | if (ret) |
1225 | goto error_ret; | |
1226 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_INT_MASK, | |
25888dc5 JC |
1227 | (st->rx[0] & |
1228 | ~(SCA3000_INT_MASK_RING_THREE_QUARTER | | |
1229 | SCA3000_INT_MASK_RING_HALF | | |
1230 | SCA3000_INT_MASK_ALL_INTS))); | |
574fb258 | 1231 | error_ret: |
25888dc5 | 1232 | mutex_unlock(&st->lock); |
574fb258 | 1233 | return ret; |
574fb258 JC |
1234 | } |
1235 | ||
8e828752 | 1236 | static int __devexit sca3000_remove(struct spi_device *spi) |
574fb258 | 1237 | { |
83f0422d JC |
1238 | struct iio_dev *indio_dev = spi_get_drvdata(spi); |
1239 | struct sca3000_state *st = iio_priv(indio_dev); | |
67ad4e08 | 1240 | |
574fb258 | 1241 | /* Must ensure no interrupts can be generated after this!*/ |
67ad4e08 | 1242 | sca3000_stop_all_interrupts(st); |
3e2c96ea | 1243 | if (spi->irq) |
25888dc5 | 1244 | free_irq(spi->irq, indio_dev); |
d2fffd6c | 1245 | iio_device_unregister(indio_dev); |
14555b14 | 1246 | iio_buffer_unregister(indio_dev); |
574fb258 | 1247 | sca3000_unconfigure_ring(indio_dev); |
7cbb7537 | 1248 | iio_device_free(indio_dev); |
574fb258 | 1249 | |
574fb258 JC |
1250 | return 0; |
1251 | } | |
1252 | ||
25888dc5 JC |
1253 | static const struct spi_device_id sca3000_id[] = { |
1254 | {"sca3000_d01", d01}, | |
1255 | {"sca3000_e02", e02}, | |
1256 | {"sca3000_e04", e04}, | |
1257 | {"sca3000_e05", e05}, | |
1258 | {} | |
1259 | }; | |
55e4390c | 1260 | MODULE_DEVICE_TABLE(spi, sca3000_id); |
574fb258 | 1261 | |
25888dc5 JC |
1262 | static struct spi_driver sca3000_driver = { |
1263 | .driver = { | |
1264 | .name = "sca3000", | |
1265 | .owner = THIS_MODULE, | |
1266 | }, | |
1267 | .probe = sca3000_probe, | |
1268 | .remove = __devexit_p(sca3000_remove), | |
1269 | .id_table = sca3000_id, | |
1270 | }; | |
ae6ae6fe | 1271 | module_spi_driver(sca3000_driver); |
574fb258 | 1272 | |
0f8c9620 | 1273 | MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>"); |
574fb258 JC |
1274 | MODULE_DESCRIPTION("VTI SCA3000 Series Accelerometers SPI driver"); |
1275 | MODULE_LICENSE("GPL v2"); |